Recombinant porcine liver esterases, their use and a method for the production thereof
申请人:——
公开号:US20040161836A1
公开(公告)日:2004-08-19
The invention relates to biotechnologically expressible, enzymically active recombinant porcine liver esterases, to a biotechnological method for the preparation thereof and to the use thereof in organic synthesis. The monomeric subunits of recombinant porcine liver esterase are truncated at their C-terminal end, compared with naturally occurring porcine liver esterase subunits. Moreover, it has proved to be an additional advantage to truncate the N-terminal end as well.
SIX-MEMBERED HETEROCYCLIC COMPOUND AND THE USE THEREOF
申请人:Asahi Kasei Pharma Corporation
公开号:EP1847533A1
公开(公告)日:2007-10-24
A compound represented by the general formula (I) or a salt thereof:
[T represents oxygen atom and the like; V represents CH2 and the like; RO1 to RO4 represent hydrogen atom and the like; A represents a linear alkylene group or linear alkenylene group having 2 to 8 carbon atoms and the like; D represents carboxyl group and the like; X represents ethylene group, trimethylene group and the like; E represents -CH(OH)- group and the like; and W represent -U1-(RW1)(RW2)-U2-U3 group (U1 represents a single bond, an alkylene group having 1 to 4 carbon atoms and the like; RW1 and RW2 represent hydrogen atom and the like; U2 represents a single bond, an alkylene group having 1 to 4 carbon atoms and the like; and U3 represent an alkyl group having 1 to 8 carbon atoms and the like), or a residue of a carbon ring or heterocyclic compound], which can be utilized as an active ingredient of medicaments effective for prophylactic and/or therapeutic treatment of skeletal diseases such as osteoporosis and fracture, glaucoma, ulcerative colitis and the like.
A group of esterases for the enantioselective production of fine and speciality chemicals
申请人:B.R.A.I.N. Biotechnology Research And Information
Network AG
公开号:EP2377930A1
公开(公告)日:2011-10-19
The present invention relates to a polynucleotide consisting of more than 30 nucleotides encoding an enzyme having carboxylesterase [E.C. 3.1.1.1] activity, wherein the coding sequence is selected from the group consisting of (a) a polynucleotide encoding an amino acid sequence as depicted in SEQ ID NO: 6; (b) a polynucleotide consisting of or comprising a nucleotide sequence, wherein the nucleic acid sequence is as shown in SEQ ID NO: 5; (c) a polynucleotide consisting of or comprising a nucleotide sequence encoding a fragment or derivative of an enzyme encoded by a polynucleotide of (a) or (b), wherein in said derivative one amino acid residue is conservatively substituted compared to the amino acid sequence of (a); (d) a polynucleotide encoding an enzyme having carboxylesterase activity which polynucleotide is at least 66% identical to a polynucleotide encoding an enzyme as shown in SEQ ID NO: 5; (e) a polynucleotide consisting of or comprising a nucleotide sequence the complementary strand of which hybridizes under stringent conditions to a polynucleotide as defined in any one of (a) to (b); and (f) a polynucleotide consisting of or comprising a nucleotide sequence being degenerate to the nucleotide sequence of the polynucleotide of (e); or the complementary strand of such a polynucleotide of (a) to (f).
本发明涉及一种由 30 个以上核苷酸组成的多核苷酸,该多核苷酸编码一种具有羧基酯酶[E.C. 3.1.1.1]活性的酶的多核苷酸,其中编码序列选自由 SEQ ID NO: 6 所示的氨基酸序列的多核苷酸组成的组;(b) 由核苷酸序列组成或包含核苷酸序列的多核苷酸,其中核酸序列如 SEQ ID NO:5中所示;(c)由编码(a)或(b)的多核苷酸编码的酶的片段或衍生物的核苷酸序列组成或包含该核苷酸序列的多核苷酸,其中在所述衍生物中,与(a)的氨基酸序列相比,一个氨基酸残基被保守取代;(d) 编码具有羧基酯酶活性的酶的多核苷酸,该多核苷酸与 SEQ ID NO:5;(e)由核苷酸序列组成或包含核苷酸序列的多核苷酸,其互补链在严格条件下与(a)至(b)中任一项所定义的多核苷酸杂交;和(f)由核苷酸序列组成或包含与(e)的多核苷酸的核苷酸序列退化的核苷酸序列的多核苷酸;或(a)至(f)的这种多核苷酸的互补链。
Screening on the use of Kluyveromyces marxianus CBS 6556 growing cells as enantioselective biocatalysts for ketone reductions
作者:Paola Vitale、Filippo Maria Perna、Maria Grazia Perrone、Antonio Scilimati
DOI:10.1016/j.tetasy.2011.11.014
日期:2011.12
The versatility of Kluyveromyces marxianus CBS 6556 growing cells in the enantioselective reduction of ketone functionalities to the corresponding alcohols was exploited. In particular, methyl ketones were reduced to (S)-alcohols with ees of up to 96%. Longer chain alkyl ketones afforded, under the same experimental condition, (R)-alcohols with an ee of up to 84%. Interestingly, carbon-carbon double and the triple bonds can also be reduced in the presence of Kluyveromyces marxianus CBS 6556 yeast. A cyclic ketone, such as 2-tetralone, was also quantitatively reduced to its corresponding (S)-alcohol with ee = 76%. (C) 2011 Elsevier Ltd. All rights reserved.
Biocatalytic Asymmetric Hydroxylation of Hydrocarbons with the Topsoil-Microorganism <i>Bacillus </i><i>m</i><i>egaterium</i>
作者:Waldemar Adam、Zoltan Lukacs、Dag Harmsen、Chantu R. Saha-Möller、Peter Schreier
DOI:10.1021/jo991725s
日期:2000.2.1
A Bacillus megaterium strain was isolated from topsoil by a selective screening procedure with allylbenzene as a xenobiotic substrate. This strain performed the hydroxylation chemoselectively (no arene oxidation and overoxidized products) and enantioselectively (up to 99% ee) in the benzylic and nonbenzylic positions of a variety of unfunctionalized arylalkanes. Salycilate and phenobarbital, which are potent inducers of cytochrome P-450 activity, changed the regioselectivity of the microbial CH insertion, without an effect on the enantioselectivity. The biotransformation conditions were optimized in regard to product yield and enantioselectivity by variation of the oxygen-gas supply and the time of the substrate addition. The different product distributions (alpha- versus beta-hydroxylated product) that are obtained on induction of cytochrome P-450 enzyme activity demonstrate the involvement of two or more hydroxylating enzymes with distinct regioselectivities in this biotransformation. An oxygen-rebound mechanism is assumed for the cytochrome P-450-type monooxygenase activity, in which steric interactions between the substrate and the enzyme determine the preferred face of the hydroxy-group transfer to the radical intermediate.